Lightroom: Is there a fast way to turn off/on export of all synonyms?

For my website I want to have keywords with my photos - of course who would not. But my webspace provider would restrict the amount of keywords per photo to be indexed for searches to 30. Since I have set up around 23000 different keywords with synonyms and am using them frequently (of course not 23000 on one photo) I am above that limit very fast, if I export my photos including the synonyms, which now is activated for every single one of them.
Is there any fast way to turn of the export of synonyms, so that I do not have to edit every single keyword to get that mark out of that one box?

If there is no such fast track - I would love this as a future feature :)

@Rob Cole: Thanks for your little update and your more complex tool. That helps me get my keywords sorted easily - I saw myself going through all my keywords manually and that on a few LR catalogues, would have taken ages I suspect.